Telephone-receiver.



M. SETTER. TELEPHONE RECEIVER.-

' Patented Deo.,23, 1913.

APPLICATION FILED MR. 12,1906. 1,082,289m

UNITED STATES vPATENT oEErcE.

MICHAEL SETTER, OF CHICAGO, ILLINOIS, SSIGNOR, BY MESNE ASSIGNMENTS, TO FIRST TRUST AND SAVINGS BANK, TRUSTEE, 0F CHICAGO, ILLINOIS.

TELEPHONE-RECEIVER.

Specification of Letters Patent.

Patented Dec. 23, 1913.

Arplication led Iaroh 12, 1906. Serial No. 305,470.

T0 all whom t may concern:

Be it known that I, MICHAEL SETTER, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new andnseful Improvement in Telephone Receivers, of which the following is a specification.

My invention relates, to telephone receivers of that particular type in which the electro-magnet cores are mounted in the cup to which the permanent-magnet is secured, and upon the perimeter of which both the casing and the diaphragm are clamped and firmly held in place by the usual screwthreaded cap or centrally apertured cover.

JGenerally stated, the object of my invention is. the provision of an improved and highly eflicient telephone receiver.

Special objects of my invention are to provide improved connections between the cord and the magnet-coils, to provide an improved arrangement for connecting the cores or pole-pieces with the cup and permanent magnet, and to provide certain details and features of improvement tending to increase the lgeneral efficiency and serviceability of a receiver of this particular character.

To the foregoing and other useful ends,

my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings, Figure 1 is a longitudinal section of a telephone receiver embodying the principles of my invention, showing the rear end of the permanent magnet in elevation. Fig.` 2 is a lonfritudinal section of the same on a line at right-angles to the section in which Fig. 1 is taken, and showing the magnets in side elevation, a portion of the permanent magnet being broken away to bring into view the stem or shank of the cup. Fig. 3 is a detail perspective view of one of the electro-magnet coils and its cc re or pole-piece. Fig. 41s a face view of the cup with the electro-magnet coils and pole-pieces in place. Fig'. 5 is a detail. view showing one of the electrical connections taken apart. Fig. 6 is a detail perspective of the cup and its integral stem or shank. Fig. 7 is a detail side elevation or face View of one of the electrical-connections, showing adjacent portions of the permanent magnet and the cup. Fig. 8 is a detail sectional view showing the method of mounting the core or pole-pieces on the stem orshank of the cup.

As thus illustrated, my receiver comprises the usual .casing A of rubber or other suitable material, and the screw-threaded cap or` centrally apertured cover B, which latter may also consist of hard -rubber or other suitable insulating material. The cup C has a rim or perimeter c connected with the bottom wall c1 by means of side portions 02, thus leaving gaps or openings c at the sides of the cup. The stem or shank c* is cast integral with the said cup, extends rearwardly from thel bottom thereof, and is provided with a couple of flat seats or faces o, and also with a couple of transverse openings c and o7, each opening having a longitudinal rib or projection c. It will also be seen that the said stem or shank is provided with a transverse opening c which extends at right-angles to the openings c6 and 07. Furthermore, the said stem or shankis provided at each side and in its Hut seats or faces 'with sockets c1". AOpenings or slots 011 are provided in the bottom of the cup,

are provided. with coils d and adapted to have their integral lugs or projections al* held in engagement with the sockets 0.1", as shown more clearly in Fig. 8. It will be seen that these cores or pole-pieces are provided with round openings or holes d2 adapted to register with the opening o9 in the stem or shank of the cup. After the cores or pole-pieces are assembled in place, the poles of the permanent magnet E are then clamped latwise upon the said co'res or pole-pieces by a bolt F of brass or -other suitable material. For this purpose it will be seen that the said permanent magnet has its ends or poles provided with openings adapted to register with the openings d2 and c", as shown more clearly in Fig. 1. It will be understood that the said cup and its integral stem or shank are cast of Franklin metal or other suitable non-magnetic material, wherebyr the ,magnetic lines of force are not shorbcircuited between the po1epieces of the magnet. if.

The perimeteror rrim' c of the cup is clamped between' the sleeve or easing and preventing the linner structure of the. re

vthe cap B, asshown in thdrawings, thus a rubber bushing G and the opening cl is provided with a similar bushing rhe liexible cord containing the usual conductors passes through an opening in the rear of the A.casing and is tied on the hub or erosspiece e of the permanent magnet. The terminals z' are then led downwardly and disposedI at oppositesidesot the stem or shank of the cup, as shown more clearly in Fig. 2. The electromagnet coil terminals J are also extended upwardly at each side of the strucf ture, passing through the openings cl2, as shown in the drawings. Each terminal J has a couple of screw openings j and jl, the end of the terminal being provided with cheeks or side flanges jz, as shown in Fig. 5. A strip of rubber or other suitable insulation K is applied tiatwise to each side of the stem or shank of the cup. The ter-mr nals or conductors J are then laid upon the outer surfaces of these strips of insulation, and the terminals i then adjusted in place between the ianges je, at each side of the structure. Screws L are then inserted into the bushing G for the purpose of holding the terminals z' in contact with the terminals J, so as to complete the circuit of the receiver. Screws M are inserted in the bushing H for the purpose of Vsecuring the terminals J and the insulated strips l( to the stem or shank of the cup. ln this ivay the cores or pole-pieces of the electro-magnet coils can be irst inserted through the openings 011, and the terminals J can then be secured in place, in the manner shown. After this the permanent magnet can be secured in place upon the stem or shank et the'cup, substantially in the manner shown and described. The cord can then be tied to the end of the permanent magnet, and its terminals 'i electrically connected With the terminals J, in the manner shown and described. After this the cord can be threaded through the casing, so as to permit the latter to slide over the magnetI structure. The diaphragm N can then be applied to the edge or perimeter of the cup, and then the cap B can be screwed upon the easing for the purpose o1 firmly clamping the cup and diaphragm between its inner i'ace and the edge or perimeter ot the casing. ln this ivay the structure is all rigidly and firmly conneeted in such manner as to permit the parts to be readily removed or inspected to permit repairing and cleaning.

lli/ith the provision oit' the lugs fZ, which can be termed by a partial punching operation, as shown in Fig. 8, it is evident that the cores or pole-pieces D will be held firmly in place upon the stem or shank which is east integral with the cup. thus preserving at all times the proper distance between the diaphragm and the poles ot the magnet. The ribs or projections o8 prevent the rnbloer bushings from turning when the screws noeaase L and M are inserted for the purpose of completing and holding the connect-ions in place.

It will be seen that the flanges X at each side et the stem or shank et engage the edges of the pole-pieces l), thus further serving to prevent displacement. ot the latter. Vilhen the ends of the permanent magnet E are placed over the pole-pieces, the latter are practically secured in place and cannot be disarranged, this being true even before the bolt F is' inserted. It will be seen that the openings 011 are large enough to permit lateral or sidewisemovement et the polepieces D, which motion is necessary in order to insert and release the said pole-pieces.

lVhat l claim as my inventionv isal. ln a telephone receiver, a cup formed with an integral bottom provided With aV stem or shank having sockets and an opening, electro-magnet cores or pole-pieces provided with integral lugs adapted to engage said sockets, and each provided with an opening adapted to register with the opening in the said stein or shank, the bottom ot said cup having` openings permitting lateral movement of said pole-pieces, a magnet havingopenings adapted to register With said other openings, .a transverse bolt ot nonmagnetic material extending through said openings to clamp the magnet and polepieces and stem or shank tightly together, with the said pole-pieces and stein or shank inside ot said magnet, a diaphragm, and means for clamping the diaphragm npon the rim or outer edge of said cup.

2. ln a telephone receiver, a cup made of non-magnetic material and having a bottom provided ivith an integral stem or shank, electro-magnet cores or pole-pieces extend ing through the bottom ot said cup and provided with integral lugs or projections suitably engaging the outside et said stem or shank, the bottom et said cup having opere ings permitting lateral movement of said pole-pieces, a permanent magnet, means for binding the permanent magnet and eleetro- -magnet cores and the said stem or shank tightly together, with the said stem or shank between the poles ot' the permanent, magnet` circuit connections secured to and insulated from the said stem or shank, a. diaphragm, and means for clamping the diaphragm upon the rim or outer edge ot id cup.

3. ln a telephone receiver, the combination ot a cup provided with a bottom formed with an integral stem or shank having sockets and tlat outer seats or faces, tlat electromagnet cores or pole-pieces provided With integral projections adapted to engage said sockets, a permanent magnet, a single bolt extending transversely through and clamping the permanent magnet and polo-pieces and stem or shank tightly together, with the said pole-pieces and stem or shank inside of said magnet, a cord tied to the rear end of the permanent magnet, magnet-coil termi nals secured in place and electrically connected With terminals of said cord, and a diaphragm, casing and cap, all constructed and organized substantially as and for the purpose set forth.

4. In a telephone receiver, a non-magnetic metal member, electro-magnet cores or polepieces provided With inner lateral projections adapted to be suitably engaged by the outer sides of said non-magnetic member to prevent relative displacement, said member having openings permitting lateral movement of the polepieces, means for clamping the said pole-pieces and mon-magnetic member together, with the pole-pieces outside of the non-magnetic member, and a diaphragm secured to said non-magnetic member and disposed in proper relation to said electromagnet cores or pole-pieces.

5. In a telephone receiver, a non-magnetic member, a diaphragm secured thereto, said member having a plurality of sockets at each outer side thereof, a pair of electro-magnet cores or pole-pieces provided with inner lateral projections adapted to engage said sockets, said member having openings permitting lateral movement of the pole-pieces, and means for securing the non-magnetic member and electro-magnet cores or polepieces'tight-ly together, with the pole-pieces outside of the non-magnetic member, Whereby the ends of said cores or pole-pieces are retained at the proper distance from said diaphragm.

6. A telephone receiver comprising a cup having a stem, pole-pieces bearing against the outer sides of said stem, a magnet having portions lying outside of said pole-pieces, a single bolt extending through the magnet and stem and pole-pieces, means on the stem and pole-pieces for preventing displacement of the latter, the bottom of said cup having openings permitting lateral movement of said pole-pieces relative to each other, Wind ings on said pole-pieces, and a diaphragm.

7. A telephone receiver comprising a magnet structure, pole-pieces, a single bolt eX- tending through the said structure and polepieees, means on said structure and polepieces for preventing displacement ofA the,

latter, the bottom of said cup having openings permitting lateral movement of said pole-pieces relative to each other, windings on said pole-pieces, and a diaphragm.

8. In a receiver, a stem or shank, polel pieces adapted to. engage opposite sides of said lstem or shank, means for preventing displacement of the pole-pieces on the said stem or shank, means permitting lateral or sidevvise motion of the pole-pieces relative 'to each other during insertion or removal thereof, and means for clamping the polepieces upon the said stem or shank.

Signed by me at Chicago, Cook county, Illinois, this 7 th day of March, 1906.

MIQHAEL SETTER.

Witnesses:

E. D. FALns, E. A. MELLINGER. 

